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Digital portable terminal and digital signal processing equipment

A portable terminal and digital signal technology, which is applied in the field of image sequence coding and decoding, and can solve problems such as accumulation of rounding errors

Inactive Publication Date: 2004-11-24
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0021] As related to the previous, for methods of encoding and decoding image sequences that perform inter-frame prediction, the luminance and chrominance intensities are quantized, and problems arise from the accumulation of rounding errors

Method used

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  • Digital portable terminal and digital signal processing equipment
  • Digital portable terminal and digital signal processing equipment
  • Digital portable terminal and digital signal processing equipment

Examples

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Embodiment Construction

[0046] First, the circumstances in which cumulative rounding errors occur as related to prior art must be considered. An example of an image sequence encoded by an encoding method capable of performing both unidirectional prediction and bidirectional prediction as in MPEG.1, MPEG.2 and H.263 is shown in Figure 5 middle. The picture 501 is a frame encoded by an intra-frame encoding device, called an I frame. In contrast, pictures 503, 505, 507 and 509 are called P frames, and these frames are coded by unidirectional interframe coding using the previous I or P frame as a reference picture. Therefore, when the picture 505 is coded, for example, the picture 503 is used as a reference picture and interframe prediction is performed. Pictures 502, 504, 506 and 508 are referred to as B frames, and bi-directional inter prediction is performed using previous and subsequent I and P frames. The B frame is characterized in that it is not used as a reference picture when inter-frame pre...

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Abstract

In order to prevent accumulation of rounding errors caused by the integer-based bilinear interpolation used in the motion compensation process of image coding and decoding methods, two types of P frames are used for unidirectional motion compensation prediction, namely: P+ frames, which round the results of bilinear interpolation with real number operations to the nearest integer and rounds half integer values (0.5 added to an integer) away from zero, and P- frames, which differs from P+ frames in that the above mentioned half integer values are rounded towards zero. Utilising both of these P+ and P- frames enables cancelling of rounding errors and prevents the accumulation of rounding errors.

Description

[0001] This application is a divisional application of the application No. 98102981.7, the title of the invention is "Image Sequence Coding Method and Decoding Method", and the filing date is June 9, 1998. technical field [0002] The present invention relates to a method for encoding and decoding a sequence of images using quantized values ​​for chrominance or luma to perform interframe prediction. Background technique [0003] In the efficient coding of image sequences, interframe prediction (motion compensation) using the similarity of preceding adjacent frames is known as an efficient technique for data compression. The most commonly used motion compensation method today is data block matching with half-pixel precision, which is used in the international standards MPEG1 and MPEG2 of H.263. In this method, the coded picture is segmented into blocks, and the horizontal and vertical components of the motion vectors of these blocks are estimated as integer multiples of half ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/232G06F7/38G06T9/00H03M7/36H04N7/24H04N19/102H04N19/103H04N19/105H04N19/112H04N19/134H04N19/136H04N19/137H04N19/159H04N19/172H04N19/186H04N19/196H04N19/423H04N19/46H04N19/50H04N19/503H04N19/51H04N19/523H04N19/577H04N19/59H04N19/593H04N19/61H04N19/625H04N19/70H04N19/85
CPCH04N19/00303H04N7/26861H04N19/00278H04N7/26047H04N19/00569H04N7/26058H04N19/00684H04N19/00721H04N19/00739H04N19/00781H04N19/00218H04N19/00757H04N19/00066H04N7/462H04N7/506H04N19/00545H04N7/26085H04N19/00812H04N19/00909H04N19/00284H04N19/00266H04N19/00703H04N7/361H04N19/00054H04N19/00315H04N19/0063H04N7/26313H04N19/00587H04N7/364H04N7/26244H04N19/00096G06T9/004H04N7/50H04N7/502H04N19/00533H04N7/26212H04N7/2626H04N19/0009H04N7/26808H04N7/26271H04N19/50H04N19/139H04N19/176H04N19/172H04N19/46H04N19/51H04N19/61H04N19/114H04N19/117H04N19/124H04N19/126H04N19/186H04N19/18H04N19/182H04N19/177H04N19/45H04N19/523H04N19/86H04N19/59H04N19/577H04N19/521H04N19/625G06T7/223G06T7/262H04N19/159H04N19/513H04N19/44H04N19/52H04N19/547H04N19/19H04N19/90H04N19/597H04N19/127H04N19/16H04N19/184H04N19/573H04N19/587H04N19/105H04N19/94H04N19/115
Inventor 中屋雄一郎
Owner HITACHI LTD
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